NXP Semiconductors MC912DG128ACPV

Overview

MC912DG128ACPV from Freescale Semiconductor is a 16-bit HCS12 microcontroller featuring 128 KB on-chip Flash EEPROM, 4 KB RAM, and integrated MSCAN 2.0B controller for automotive network communication. It operates at up to 25 MHz core frequency with PLL clock multiplication, supports 10-bit ADC (8-channel), PWM, ECT, SPI, SCI, and I²C interfaces, and targets engine control units and body electronics.

For engineers reviewing the MC912DG128ACPV datasheet, MC912DG128ACPV pinout, MC912DG128ACPV application, or MC912DG128ACPV equivalent, this page delivers verified technical context, package mapping, functional specifications, and real-world use cases aligned with Freescale's MC68HC912DG128A documentation (Rev. 4, 2003).

Technical Context

The MC912DG128ACPV implements the HCS12 CPU core derived from the Motorola 68HC12 architecture, supporting enhanced addressing modes and 16-bit data paths. It integrates a Phase-Locked Loop (PLL) for scalable system clock generation, with configurable dividers enabling multiple synchronous clock domains for peripherals including MSCAN, ATD, and PWM.

Its memory subsystem includes 128 KB of user-programmable Flash EEPROM with block protection, 4 KB of RAM, and 512 bytes of EEPROM for nonvolatile parameter storage. The device supports Background Debug Mode (BDM) via dedicated pins for in-circuit emulation and flash programming without external hardware debug adapters.

Key Specifications

Pinout & Package

MC912DG128ACPV is housed in a 112-pin Quad Flat Package (QFP), case number 987, with 0.65 mm lead pitch and 20.0 × 20.0 mm body size. Pin assignments follow the MC68HC912DG128A specification (Section 3.2, Figure 3-2).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit automotive microcontroller applications.

Compared with MC912DG128ACPV, MC9S12XDP512 delivers 4× Flash capacity and hardware acceleration for math-intensive tasks, while S912XEQ512J2 provides dual CAN and enhanced analog performance-both require PCB redesign but offer measurable gains in scalability and long-term supply assurance.

Availability

MC912DG128ACPV is available at Aetrix Electronics and suitable for engine control units, body electronics modules, and transmission control systems requiring stable component supply and long-term industrial availability.

Supply support for MC912DG128ACPV includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Freescale Semiconductor (now part of NXP Semiconductors) was a leading designer of embedded processors and analog/mixed-signal ICs for automotive, industrial, and networking markets.

The MC912DG128ACPV belongs to the HCS12 microcontroller family, engineered specifically for cost-sensitive, safety-critical automotive applications requiring robust CAN communication, real-time control, and flash-based firmware updates.

FAQ

What is the maximum operating frequency of the MC912DG128ACPV?

The MC912DG128ACPV achieves a maximum core frequency of 25 MHz using its internal Phase-Locked Loop (PLL) with external crystal input (typically 4 MHz). The PLL multiplies the reference clock and divides the output to generate stable system clocks for CPU and peripherals. This frequency is validated across the full –40 °C to +85 °C temperature range and 4.5–5.5 V supply, as specified in Section 12.7 of the MC68HC912DT128A Technical Data document (Rev. 4, 2003).

Does the MC912DG128ACPV include built-in CAN transceiver circuitry?

No, the MC912DG128ACPV integrates only the MSCAN 2.0B controller logic-not the physical layer transceiver. It requires an external high-speed CAN transceiver (e.g., MC33388 or TJA1042) connected to CANTX and CANRX pins to drive the CAN bus. This separation allows design flexibility in selecting transceivers with specific fault protection, slew rate, or EMC characteristics required by the target application.

How is flash memory programmed and secured on the MC912DG128ACPV?

Flash programming on the MC912DG128ACPV is performed in-system via BDM or standard serial interfaces using Freescale's PROG12Z or Cyclone tools. Security is enforced through two bits: FPOPEN (Flash Protection Enable) and SEC (Security Enable). When both are set, the Flash becomes read-protected and prevents unauthorized access or reprogramming-critical for protecting proprietary calibration data and firmware intellectual property.

What debugging interface does the MC912DG128ACPV support?

The MC912DG128ACPV supports Background Debug Mode (BDM) via a single-wire serial interface using the BKGD pin. BDM enables full memory and register visibility, breakpoint setting, and real-time execution control without halting the entire system. It eliminates the need for expensive in-circuit emulators and is fully supported by CodeWarrior Development Studio v5.1 and later versions for HCS12 targets.

Is the MC912DG128ACPV pin-compatible with other HCS12 derivatives like the MC912DT128A?

Yes, the MC912DG128ACPV shares identical pinout, package (112-pin QFP), and electrical characteristics with the MC68HC912DT128A and MC68HC912DG128A variants per Section 3.2 and Figure 3-2 of the official datasheet. Differences lie in mask-set revisions, oscillator configurations (Colpitts vs. Pierce), and minor electrical specs-not mechanical or logical compatibility. This enables direct substitution in existing PCB layouts.